Collin County, TX SWPPP & Stormwater Requirements
In Collin County, stormwater rules come in two layers - the state permit every site shares, and the cities that sharpen it. Which layer bites hardest depends entirely on which city you are building in.
What are the SWPPP and stormwater requirements in Collin County?
Every Collin County construction site starts from the state permit: TXR150000 defines small construction activity to include clearing, grading, and excavating that disturb at least one acre and less than five acres. But the sharper requirements - lower triggers, mandatory local forms, city inspectors - come from the individual cities; on unincorporated county land the state permit generally governs.
Where the county itself fits
Texas counties do not issue zoning or building permits for private construction the way cities do, so on unincorporated Collin County land the state permit usually stands alone - with one connection to the county. Two days before commencing construction activities, primary operators must provide a copy of the signed NOI to the operator of any MS4 receiving the discharge and to any secondary construction operator. Where the county runs the receiving storm sewer, the county gets that copy; inside a city, the city does. Most Collin County construction, though, happens inside the cities - and that is where the requirements sharpen.
The cities set the specifics
Collin County's cities do not read the permit the same way, and the differences are the part worth knowing before you bid.
Frisco. Frisco requires wire reinforcement on all silt fence used for erosion control. Full requirements: Frisco.
Celina. Celina requires a valid earthwork permit from the city before commencing disturbance of 0.1 acre or more of land. That is a far lower trigger than the state's one-acre floor. Celina also stands alone in the region. In the spring of 2021, Celina was awarded the first-ever Gold iSWM designation by the North Central Texas Council of Governments. Full requirements: Celina.
McKinney. Within the City of McKinney, all soil disturbing activities require a grading permit. There is no acreage floor at all. Full requirements: McKinney.
Plano. The City of Plano requires the owner — or the owner and their contractors — to use Plano's standard SWPPP sheets for projects within the city's jurisdiction. A city-specific document set, not just the state forms. Full requirements: Plano.
Prosper. Prosper requires all contractors and subcontractors identified in an SWPPP to sign a certification statement — beginning "I certify under penalty of law" — before conducting any professional service identified in the SWPPP. Full requirements: Prosper.
Why the deltas matter
The pattern across Collin County is consistent - the state permit sets a floor, and the cities raise it. A plan that satisfies the state can still fail a city review, and the fastest way to lose a week is to find a city-specific requirement at the pre-construction meeting instead of at the bid. Each city page above carries its jurisdiction's rules in full, verified against the city's own published standards.
Frequently Asked Questions
Does Collin County itself review SWPPPs?
Not the way a city does. Texas counties do not issue zoning or grading permits for private construction, so on unincorporated county land the state permit generally governs, with a copy of the notice going to the county where it runs the receiving storm sewer. The detailed requirements come from the cities.
What is the smallest site that triggers requirements in Collin County?
It depends on the city. The state permit engages at one acre, but Celina's earthwork permit starts far lower and McKinney requires a grading permit for any soil disturbance at all. Confirm the specific city before assuming the one-acre floor applies.
Do I need city-specific forms for a Collin County project?
Sometimes. Several Collin cities require their own SWPPP sheets, certifications, or sign-offs on top of the state plan - Plano's standard sheets and Prosper's contractor certification are two examples. The city page tells you which apply.
Which cities does this guide cover?
The verified requirement pages for Frisco, Celina, McKinney, Plano, and Prosper - the busiest construction cities in Collin County - each built from that city's own published standards.
Request a bid
Send your Collin County project - its city, acreage, and start date - to bids@terradynegroup.com or call (214) 878-7392, and the plan is built to the jurisdiction that actually reviews it. The full jurisdiction map is at Local Compliance.